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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeef53abce33731c9caec55e07094b78a464ab11e823ee8d34ac3a300131f4de' 
  AND token = 'tVcZqIyPtBqpKhReUDYbV84ne5LN/14Ggf8j6ERcI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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