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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5f5e547c08d9e18c50eb3341c2d836e5395605e392a979ea84b2fa7cb11b38' 
  AND token = '+yjnVfdYEfJ+FLNMIokD9HOHJni09Me2IoBqREK+SJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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