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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3733514117aab93bd5cb01a63b005380c96c5eac9292f48a9e015752ddb0ded1' 
  AND token = '1dkVv314JpY/txrsSsTLHFNzofBwWOe1Xymek6Vx+y0=' 
  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"
    }
  }
}