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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b86538611c73130488579c60382a24c64f010062fc4e12e7fd9884c5ec1996a' 
  AND token = '5BnQMpY1nG4/C4pr0z3NswmgKOW51QQqVo5CFiRu3a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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