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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba5b3cc07d94ccc45c95921313bfb519e39c8b691148ef30bc8629bd2a18375' 
  AND token = 'b1qGKvuafcR83dawPFUm4jJ/8jlbrCN4qQ5VHhMq4y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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