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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4aafc70a42cc04f9e88dffe150aa3a606d584035d788c7faab8534e8e61685' 
  AND token = '47+O7h56LHkoNRm1UONVC9E3Pdaq91Iyxn0D5QKkTnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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