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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5777ec37c7474b8633d108f389cc095fa8acfed06bcf878062cc7d1ee0fe117d' 
  AND token = '1nrW9castpPPZaH0UHStodIk7oCie1Gj7jebnr8A5Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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