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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ae35489ae05b2a8034962d157c5fc260ef3f618e545e45d9075676c46fe1a8' 
  AND token = 'Ecwt9pA0Em1Nrg+pifncDYVJ87Y4jVq4apudpbcWc9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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