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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f1f91b39b9bd16486830181d4d5a271133f97174fc6c885bdd6d77dbc18f7f' 
  AND token = 'BRvxzHGPiWswXAIXXwGxAARAa+TOfrLS4fze0JtMcbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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