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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c53d5a8315d6b3711ae4c905d78c5d85cc8bd0374f918688991a3d9e8a7d21' 
  AND token = 'LCuiqGZzaxqntZM2RRleC3Rn16GMXWz0xJuOLNQkfec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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