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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1509191fe27ceac968b8e07bedc8fc85a217900a734f8099dca496793be49a' 
  AND token = 'QV0zuf19aKz2rtiFRf1DwLZWqNuqGGytBYlOFclI3/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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