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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1d96d8721e473a2289b1ada9e90ac7fd56c24c322610224652c2de252580d3' 
  AND token = 'gw4jXXR5BCFPKN5kt81JG1fpQZ+dBhxVIBRVMvToR54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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