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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1640fd257529394d5911a6cdb6c4d223c4df075b6c43d6036630110f0460ec9' 
  AND token = 'Tq5jEikLSTlLXkiRgzuuNZ0ipq/PktA1hCANY1rS0x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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