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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a51ee4d9a3ea15af89ea07128188d03f155e90efb81024d97e9621a6476e64' 
  AND token = 'lodqzXHUQhXVrVaS4j126vJ/uzdGeOxIaFrB0IEzRqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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