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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1466185488f22cda3794af1d69f1acab4456578755432d57f1837899a01efbba' 
  AND token = '5ld0FSrzRkkXN0m4gwek0oH6FpdIWW8AWeHl2lQbAvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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