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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf449d8a432aa6d329cf0ad4514a594831f3a68d5b9e83d936231fd6ec03c910' 
  AND token = 'UmEiXDhQDO0GtBnCxXcJ6LMr9BJoEnAl3erZpnbK61g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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