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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e0345a244ef7454c41cfc3ff8b554631724f5c371aefff406af1744aedf88e' 
  AND token = '2hiYDCRJUm3zFzrLOnWfwVvLYB+R91fUK4C1f9iFZ0w=' 
  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"
    }
  }
}