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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c809b13ebc5f43a861b2bcea351a0f4625607107ce87cadf2ae1bfced4d71434' 
  AND token = 'QhZ7lC5J8EFQsj0exS/v3F7txpIhDmbpmtRjaKrFDqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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