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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688a2453f655296cb2d31b04b8e6b07f61aa421bd2ba4d29684f66062c7d6822' 
  AND token = 'tykXA2ZOL6o41bbTvhWqbuMqzsy4Ez+b7L6RpSTOyiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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