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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218c1f6c8316ee0dc949baed814cba24bf8950f839e219e6628c84b25e6a80f8' 
  AND token = '5b/U11fc6t0k4zUVZgCrCs0xuGt1y1yEbEV7RsmGFbU=' 
  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"
    }
  }
}