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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3dc4ed5124bd0508d47e16063563ffa0d74611b1c0b1fa125a92c2cde888828' 
  AND token = 'Qgt90C05BG1xLbEKaxak1A4QSi/23Y7lAgTAe8s2B/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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