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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5441ae639836fb48e105a30f2d3a1d8a3ea5b4b2fcc907c9bd5a562c450a9cf7' 
  AND token = 'RpLLFLx3s3xs73YqlrtB0rWo41WdcirT7zry2SjKy2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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