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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2829cb92cdae61c022a5d50ab1de205b2843384c5675f3c772715cf3768ecfbb' 
  AND token = 'HG8EPItQ6B5Z+K09DTG2USIlC0N4k/QLAt5A9rjXQMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}