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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b71f5d98c7270e223a21ffd0715e45cddf56a96d135dc64e3025d1f4117e318' 
  AND token = '8t83v0QNkHOpFQdELD7tiS7OKqL8teYeJeL2qOg+86k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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