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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce7bd118a8b9ecf47eb8fdb6a20321adc64420e52ca9b4f1a41efd1e2453c1d' 
  AND token = 'CpwGswu8950BDNFBaN8ZevUQse1ypGRn54G6xv+kuQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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