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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4fe2869016a2e66ed465903fa2c3712d0268a68e5a4cc050bd2974dfe43819' 
  AND token = 'jvIkJ7DgvucnR6PapquPDkTw62U/FFvFPIN9VlDmE+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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