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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8667b8ec4eaeaccee9d3930100c75bbc0522a564f1376e9180709c76e211242' 
  AND token = 'Ho85AtHsTuy5/+/UCQXeC+I34e5W48r9DHYmyXAr4UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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