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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f812a62208e3b36ee16e9cdac2b66b7f538ba59b641053c96d2c30e2970856f' 
  AND token = 'SLTAciJURibjaytk2h/Z/sYxu3yfMA7Nw5bim3k7W3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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