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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bfbe889fff5a6580d00834b034da4112359f4a6d52717848c09c3bc65574c7' 
  AND token = 'E1B8csOGqM2NBrqpB65A11mMh8ncRiRvD40aVC7jHPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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