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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9611d06468c785e534fbfddda37c6e46a45c552bafa476c4c45c223800d3b9d9' 
  AND token = 'WFP8FB/RkdOLbtTB6B7V0rXbLMwxUV87ARF7Ayb4Wow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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