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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17be9c9d4b40a117a72a6b8f686b7ac5fd5f06da4b3f44c8231333601ffa06f' 
  AND token = 'I3QUbFrgqB41Gt0GAOrs6OXC+YJ4gRURoaN0hRikW8g=' 
  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"
    }
  }
}