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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11551d5d8ff10ec161e6ee65b08f0cab38876164286e20042dfd7461e6061f0' 
  AND token = 'P4eCrFnI9FkXit/VZ5Tlfvz1pIyvpTPkAGnLE9xOGus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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