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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bed021dcd4eca96ac606e2b3b7b231994814482cd8db31568a5e848f41b6196' 
  AND token = 'T9+FPwOkSN4ibGOyXYSS+A9sWaI43ulWk0odCGEpIu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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