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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016baa72b74e9266e99d2f7e65ad5eed02381ebb53720e5e4e7ee385611c27df' 
  AND token = '+x/qyyHioFffxKr2e/t6Gqr6ZfIsO3nXL7ZEH1ALepY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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