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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aaa2d7678b7182bd4c6b9f2d3258b7bf676381f1466e4ba37dae0a1cb301d11' 
  AND token = 'AnPgYd+QEMBqdtPg6GHAoY2CO/79+dJzt9lvv3+qyAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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