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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba7e07e1a7a4adbd10bd97c169e27ba17d756912bd59a0798c691db392ff5f0' 
  AND token = 'jSJn+9ZVHrwxAFt9GzkIlVV/gGrtzqdiIXz6Xlx6KS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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