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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafe1910cfbdb9de9dbcbfed61b8d26c00e8d25be8d5720fab0b0d71c077dfcd' 
  AND token = 'fsbYFhj4awF/cOQ4qTQmtv+FGkV0BhkLJP3h72ZbGhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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