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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3513f1ee83f63d8e1e763e877b54b001534100a7cb91d5c14fbc6dc40c711380' 
  AND token = 'lZ9Y+CLyYYibmWS00EIa+qVv+1Tg2SPxSSKPKpbz1JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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