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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64ef46d724b3128251128eb1b8b5ed1ce08072d8f57e8e0e14164b25c495b71' 
  AND token = 'rIjCH2Ammpb+8/gj5IxVwI2KYuQjET/nO6vSc3tkPm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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