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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0637259d68d1e14dccba1ed37d45366e69e9dbeea21929144e9560f6f267e0ce' 
  AND token = 'Gx03hgSIpXQGXD5/dfG7HakqSn1RuYjFkx95zFfVJ/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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