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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de99279fe7c0b7b87d42e190fd427b062eea238b81536d68ae2e5d910265584' 
  AND token = 'm7r0t+vyu2tLLEWJjnuMkWJlxZbrFsATK25VKk4acA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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