SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedba9f11147c274669728d366484f13b3184c3c635edc54ebb47fc9f278bea2' 
  AND token = 'OA7qPRChTI5wd3SrZdW96fjXz2pHp5dfzi/RnogYQn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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