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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7d742c17b1c4a09f7ee4b19ee216e82d42b36b1cbb5c89812aec562e4cae7e' 
  AND token = 'zbYDIsislsEe3nbrQD6XcgWP7ux5a3chzU7l6LwAHt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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