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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a315f6d938571efe340ec702ec562afbaa80c6409c2151b3ed1a7fae5899247b' 
  AND token = 'adFoypR9cyvtzaw6rno48nsD/DLgwsMhwegBAsvk0tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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