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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa08a27995210a97abdb0549d03dd929220d3d39c2e2b1d9f1928f8ab1c28543' 
  AND token = 'yG6gXaCNUdNstbLjbRy1IFmkj0CQJvFE3CWG8dOxsm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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