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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30985cebc9153a60d4a05eee24fb276d0def3aeb09cada109df94343d2556023' 
  AND token = 'sV+31FOVh7maQ/nLVee44Xaabw2kFc35WuYzc3YzlFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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