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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aced1145960a0e44b07fe2c6f7a6024652eaaaee654b713d12f4037b224f3ce4' 
  AND token = 'TJVxsUEQYBYFlRGhUL7wz59/Ep7uvrI2qys3NLln8TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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