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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169415308047d0e0a970442925cdb6a1ec3add1a9dab97835826bcab5ee6d3c1' 
  AND token = 'lkSe17l76+46m3J82VJumJb639O+leSqNSAqBo4VoLg=' 
  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"
    }
  }
}