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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90acce1827cb4172e161392c777e814469d79581a7e42ba79b2ab9765f9ed655' 
  AND token = 'HxFZ+lu+qn/W60arhwix4P1iqkbFU3BoV8Yxff3Y/DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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