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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c860e0127b4b3d7b281f8e904e40c260333a9a26cf5da71e48aba6a8005affd' 
  AND token = 'XW92xijGUd1n4MUBls5yzF9Q1xN/gjuoGoe/pMlSTXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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