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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0f6217d14986bedce21cc68d1e3593ec1fc580a571353d5b6d7e61a1411ee8' 
  AND token = 'SWa8eQfdmEwN+3Ej5T5W+oNDiGob60hqcnYLF4/LsNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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