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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059d560050139f7339e00a8ab8d90ea1c7e9324f135855896a686963e631686c' 
  AND token = 'SOr/zZYLrw2ORCf8PHMYoXwY5CkJYvDGgR5Oxd6nuPI=' 
  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"
    }
  }
}