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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3e82df3dd4d98251a6d6d4f2607f1f556055d9fd0218b961ea2f2aafa2b94b' 
  AND token = 'HSMrZMFeNnoh4GmQtfZdbtNOiihNG5Q3zIdCYxaHK7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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